The top circuit uses a gyrator to simulate an inductor. Inductors can be bulky, heavy, and expensive, so it is often useful to replace them with cheaper components. The simulated circuit is at the bottom. The capacitor passes high frequencies (and sudden changes), causing the op-amp's + input to be closer to the input signal. (However, due to the large (20 kΩ) resistor, not much current flows through the capacitor.) The op-amp keeps the - input at the same level as +, so less current flows through the 1 kΩ resistor, since the voltage is almost the same as at the input. The circuit blocks high frequencies, like an inductor. The capacitor blocks low frequencies (and steady-state voltages), causing the op-amp's + input to be closer to ground. The op-amp keeps the - input at the same level as +, so more current flows through the 1 kΩ resistor to ground; it passes low frequencies, like an inductor.
This page is a utility for simulating гиратор online with specified initial values.
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